TOP 10 Productivity App in the United States

Features:
－ It's FREE!
－ It plays nice with official Dropbox clients. It gives you 2GB of additional Dropbox quota for sharing when using a supplementary Dropbox account.
－ It saves you disk space on your drive. There's no need to copy files to your Dropbox folder; you can share directly from Finder or Desktop.
－ You get even more free space. You can delete screenshots and public folders from your main Dropbox account.
－ There are no additional actions. Shares your screenshot and copy links to the clipboard.
－ It lowers network traffic and reduces upload time. It automatically shares folders as zip archives.
－ Minimal CPU and memory impact.